Refactor blob storage to use UUID primary keys and implement streaming chunking

- Changed blob table to use ID (UUID) as primary key instead of hash
- Blob records are now created at packing start, enabling immediate chunk associations
- Implemented streaming chunking to process large files without memory exhaustion
- Fixed blob manifest generation to include all referenced blobs
- Updated all foreign key references from blob_hash to blob_id
- Added progress reporting and improved error handling
- Enforced encryption requirement for all blob packing
- Updated tests to use test encryption keys
- Added Cyrillic transliteration to README

internal/database/schema/008_uploads.sql

@@ -0,0 +1,11 @@
+-- Track blob upload metrics
+CREATE TABLE IF NOT EXISTS uploads (
+    blob_hash TEXT PRIMARY KEY,
+    uploaded_at TIMESTAMP NOT NULL,
+    size INTEGER NOT NULL,
+    duration_ms INTEGER NOT NULL,
+    FOREIGN KEY (blob_hash) REFERENCES blobs(blob_hash)
+);
+
+CREATE INDEX idx_uploads_uploaded_at ON uploads(uploaded_at);
+CREATE INDEX idx_uploads_duration ON uploads(duration_ms);